Deadlock on device removal event for NVMeF target

[Sagi Grimberg]

>> How about the (untested) alternative below:
>> --
>> [PATCH] nvmet-rdma: register ib_client to not deadlock in device
>>    removal
>>
>> We can deadlock in case we got to a device removal
>> event on a queue which is already in the process of
>> destroying the cm_id is this is blocking until all
>> events on this cm_id will drain. On the other hand
>> we cannot guarantee that rdma_destroy_id was invoked
>> as we only have indication that the queue disconnect
>> flow has been queued (the queue state is updated before
>> the realease work has been queued).
>>
>> So, we leave all the queue removal to a separate ib_client
>> to avoid this deadlock as ib_client device removal is in
>> a different context than the cm_id itself.
>>
>> Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
>> ---
> 
> Yes. This patch fixes the problem I am seeing.

Awsome,

Adding your Tested-by tag.

Thanks!